/**
* https://github.com/ReactiveX/RxJava/issues/198
*
* <p>Rx Design Guidelines 5.2
*
* <p>"when calling the Subscribe method that only has an onNext argument, the OnError behavior
* will be to rethrow the exception on the thread that the message comes out from the Observable.
* The OnCompleted behavior in this case is to do nothing."
*
* @throws InterruptedException
*/
@Test
@Ignore("Subscribers can't throw")
public void testErrorThrownWithoutErrorHandlerAsynchronous() throws InterruptedException {
final CountDownLatch latch = new CountDownLatch(1);
final AtomicReference<Throwable> exception = new AtomicReference<>();
Observable.create(
observer -> {
new Thread(
() -> {
try {
observer.onError(new Error("failure"));
} catch (Throwable e) {
// without an onError handler it has to just throw on whatever thread
// invokes it
exception.set(e);
}
latch.countDown();
})
.start();
})
.subscribe();
// wait for exception
latch.await(3000, TimeUnit.MILLISECONDS);
assertNotNull(exception.get());
assertEquals("failure", exception.get().getMessage());
}
/**
* Incrementing int without backpressure.
*
* @param counter
* @return
*/
private static Observable<Integer> firehose(final AtomicInteger counter) {
return Observable.create(
s -> {
Subscription s2 = new FirehoseNoBackpressure(counter, s);
s.onSubscribe(s2);
});
}
@Test
public void testPublishLast() throws InterruptedException {
final AtomicInteger count = new AtomicInteger();
ConnectableObservable<String> connectable =
Observable.<String>create(
observer -> {
observer.onSubscribe(EmptySubscription.INSTANCE);
count.incrementAndGet();
new Thread(
() -> {
observer.onNext("first");
observer.onNext("last");
observer.onComplete();
})
.start();
})
.takeLast(1)
.publish();
// subscribe once
final CountDownLatch latch = new CountDownLatch(1);
connectable.subscribe(
value -> {
assertEquals("last", value);
latch.countDown();
});
// subscribe twice
connectable.subscribe();
Disposable subscription = connectable.connect();
assertTrue(latch.await(1000, TimeUnit.MILLISECONDS));
assertEquals(1, count.get());
subscription.dispose();
}
@Test
public void testReplay() throws InterruptedException {
final AtomicInteger counter = new AtomicInteger();
ConnectableObservable<String> o =
Observable.<String>create(
observer -> {
observer.onSubscribe(EmptySubscription.INSTANCE);
new Thread(
new Runnable() {
@Override
public void run() {
counter.incrementAndGet();
observer.onNext("one");
observer.onComplete();
}
})
.start();
})
.replay();
// we connect immediately and it will emit the value
Disposable s = o.connect();
try {
// we then expect the following 2 subscriptions to get that same value
final CountDownLatch latch = new CountDownLatch(2);
// subscribe once
o.subscribe(
v -> {
assertEquals("one", v);
latch.countDown();
});
// subscribe again
o.subscribe(
v -> {
assertEquals("one", v);
latch.countDown();
});
if (!latch.await(1000, TimeUnit.MILLISECONDS)) {
fail("subscriptions did not receive values");
}
assertEquals(1, counter.get());
} finally {
s.dispose();
}
}
/**
* Incrementing int without backpressure.
*
* @param counter
* @return
*/
private static Observable<Integer> firehose(final AtomicInteger counter) {
return Observable.create(
new OnSubscribe<Integer>() {
int i = 0;
@Override
public void call(final Subscriber<? super Integer> s) {
while (!s.isUnsubscribed()) {
s.onNext(i++);
counter.incrementAndGet();
}
System.out.println("unsubscribed after: " + i);
}
});
}
@Ignore // FIXME throwing is not allowed from the create?!
@Test
public void testOnSubscribeFails() {
Subscriber<String> observer = TestHelper.mockSubscriber();
final RuntimeException re = new RuntimeException("bad impl");
Observable<String> o =
Observable.create(
s -> {
throw re;
});
o.subscribe(observer);
verify(observer, times(0)).onNext(anyString());
verify(observer, times(0)).onComplete();
verify(observer, times(1)).onError(re);
}
private static Observable<Integer> incrementingIntegers(
final AtomicInteger counter, final ConcurrentLinkedQueue<Thread> threadsSeen) {
return Observable.create(
new Publisher<Integer>() {
@Override
public void subscribe(final Subscriber<? super Integer> s) {
s.onSubscribe(
new Subscription() {
int i = 0;
volatile boolean cancelled;
final AtomicLong requested = new AtomicLong();
@Override
public void request(long n) {
if (SubscriptionHelper.validateRequest(n)) {
return;
}
if (threadsSeen != null) {
threadsSeen.offer(Thread.currentThread());
}
long _c = BackpressureHelper.add(requested, n);
if (_c == 0) {
while (!cancelled) {
counter.incrementAndGet();
s.onNext(i++);
if (requested.decrementAndGet() == 0) {
// we're done emitting the number requested so return
return;
}
}
}
}
@Override
public void cancel() {
cancelled = true;
}
});
}
});
}
@Test
public void testRequestToObservable() {
TestSubscriber<Integer> ts = new TestSubscriber<>();
ts.request(3);
final AtomicLong requested = new AtomicLong();
Observable.<Integer>create(
s ->
s.onSubscribe(
new Subscription() {
@Override
public void request(long n) {
requested.set(n);
}
@Override
public void cancel() {}
}))
.subscribe(ts);
assertEquals(3, requested.get());
}
@Test
public void testCacheWithCapacity() throws InterruptedException {
final AtomicInteger counter = new AtomicInteger();
Observable<String> o =
Observable.<String>create(
observer -> {
observer.onSubscribe(EmptySubscription.INSTANCE);
new Thread(
() -> {
counter.incrementAndGet();
observer.onNext("one");
observer.onComplete();
})
.start();
})
.cache(1);
// we then expect the following 2 subscriptions to get that same value
final CountDownLatch latch = new CountDownLatch(2);
// subscribe once
o.subscribe(
v -> {
assertEquals("one", v);
latch.countDown();
});
// subscribe again
o.subscribe(
v -> {
assertEquals("one", v);
latch.countDown();
});
if (!latch.await(1000, TimeUnit.MILLISECONDS)) {
fail("subscriptions did not receive values");
}
assertEquals(1, counter.get());
}
@Test
public void testRequestThroughTakeWhereRequestIsSmallerThanTake() {
TestSubscriber<Integer> ts = new TestSubscriber<>((Long) null);
ts.request(3);
final AtomicLong requested = new AtomicLong();
Observable.<Integer>create(
s ->
s.onSubscribe(
new Subscription() {
@Override
public void request(long n) {
requested.set(n);
}
@Override
public void cancel() {}
}))
.take(10)
.subscribe(ts);
assertEquals(3, requested.get());
}
private static Observable<Integer> incrementingIntegers(
final AtomicInteger counter, final ConcurrentLinkedQueue<Thread> threadsSeen) {
return Observable.create(
new OnSubscribe<Integer>() {
final AtomicLong requested = new AtomicLong();
@Override
public void call(final Subscriber<? super Integer> s) {
s.setProducer(
new Producer() {
int i = 0;
@Override
public void request(long n) {
if (n == 0) {
// nothing to do
return;
}
if (threadsSeen != null) {
threadsSeen.offer(Thread.currentThread());
}
long _c = requested.getAndAdd(n);
if (_c == 0) {
while (!s.isUnsubscribed()) {
counter.incrementAndGet();
s.onNext(i++);
if (requested.decrementAndGet() == 0) {
// we're done emitting the number requested so return
return;
}
}
}
}
});
}
});
}
@Test
public void testRequestThroughTakeThatReducesRequest() {
TestSubscriber<Integer> ts = new TestSubscriber<>((Long) null);
ts.request(3);
final AtomicLong requested = new AtomicLong();
Observable.<Integer>create(
s ->
s.onSubscribe(
new Subscription() {
@Override
public void request(long n) {
requested.set(n);
}
@Override
public void cancel() {}
}))
.take(2)
.subscribe(ts);
// FIXME the take now requests Long.MAX_PATH if downstream requests at least the limit
assertEquals(Long.MAX_VALUE, requested.get());
}